Is this possible?

Got Monty back from the garage today, runs sweet as a nut, but the cutting
out every 6 or 7 seconds is still there. It's passed it's test. I have a
thought about this. The chap mentioned it was blowing crankcase fumes into
the dizzy. He thinks is possibly a worn piston on number 7 (low comp) The
more I think about it, he said he took the cap off & there was pressure
there. This missing could be caused by the whole dizzy getting pressurized &
the cap lifting to release the fumes under pressure. Anyone think this is
possible, if so, can I drill a vent hole in the cap or assembly?

The cap & rotor he took off where melted & really fumed up.

I'm not really bothered by the miss, I can drive around it, but the cap &
rotor arm are gonna get fried again.

The crank vents are all clean too.

Any thoughts?

Ta

Nige

On Wed, 27 Oct 2004 14:55:25 +0100, "Nige"
<nigel.ince****[email protected]> wrote:

>Got Monty back from the garage today, runs sweet as a nut, but the cutting
>out every 6 or 7 seconds is still there. It's passed it's test. I have a
>thought about this. The chap mentioned it was blowing crankcase fumes into
>the dizzy. He thinks is possibly a worn piston on number 7 (low comp) The
>more I think about it, he said he took the cap off & there was pressure
>there. This missing could be caused by the whole dizzy getting pressurized &
>the cap lifting to release the fumes under pressure. Anyone think this is
>possible, if so, can I drill a vent hole in the cap or assembly?
>
>The cap & rotor he took off where melted & really fumed up.
>
>I'm not really bothered by the miss, I can drive around it, but the cap &
>rotor arm are gonna get fried again.
>
>The crank vents are all clean too.
>

Just a thought, are you sure it isn't the diaphram on the vacuum
advance letting things into the dizzy?

Other than that, I see no reason why you shouldn't drill a small hole
in the cap to let the fumes out, but when I consider how easily dizzys
get water in them, it seems unlikely that it would seal well enough to
keep the fumes in anyway.

Alex

<SNIP>
> Any thoughts?
>
> Ta
>
> Nige
Doesn't the shaft of the Dizzy have a small O ring to stop this ? Might just
be the path of least resistance.

Paul

On or around Thu, 28 Oct 2004 08:42:27 +0100, Megalowmania <[email protected]>
enlightened us thusly:

><SNIP>
>> Any thoughts?
>>
>> Ta
>>
>> Nige
>Doesn't the shaft of the Dizzy have a small O ring to stop this ? Might just
>be the path of least resistance.
>
>Paul

don't think so. The dizzy has a bearing at the bottom of the shaft. I'd
have thought you'd need serious engine pressure or a very worn dizzy to do
that.

mind, you've this problem with #7...

"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around Thu, 28 Oct 2004 08:42:27 +0100, Megalowmania
> <[email protected]>
> enlightened us thusly:
>
>><SNIP>
>>> Any thoughts?
>>>
>>> Ta
>>>
>>> Nige
>>Doesn't the shaft of the Dizzy have a small O ring to stop this ? Might
>>just
>>be the path of least resistance.
>>
>>Paul
>
> don't think so. The dizzy has a bearing at the bottom of the shaft. I'd
> have thought you'd need serious engine pressure or a very worn dizzy to do
> that.
>
> mind, you've this problem with #7...
>

Aye, is that likely to be a worn piston or something like a problem valve
etc?

Looks like I'm after a new engine at some point soon.

Them funny thing is, I tightened up all the belts last night as they where
well slack. This morning, it didn't miss a beat on the 9 mile journey to
work.

How odd.

Nige

Nige wrote:

> Them funny thing is, I tightened up all the belts last night as they where
> well slack. This morning, it didn't miss a beat on the 9 mile journey to
> work.

Redo the compression test, just in case the mechanic duffed up #7. I
*always* double check any low cylinders and often it's an erroneous reading.

--
EMB

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Nige wrote:
>
>> Them funny thing is, I tightened up all the belts last night as they
>> where well slack. This morning, it didn't miss a beat on the 9 mile
>> journey to work.
>
> Redo the compression test, just in case the mechanic duffed up #7. I
> *always* double check any low cylinders and often it's an erroneous
> reading.
>
> --
> EMB

I'll get it sorted at the weekend. It's funny that there's not a lot of
petrol in the tank. I'll fill it up to see if it re-appears.

I looked in the dizzy cap last night & it looked clean as a whistle, if it
where blowing through, there would be some evidence even after 20-30 miles.
He did refit the distributor, wonder if he reseated it &I its sealed it
somehow?

Very strange

Nige

The message <[email protected]>
from "Nige" <nigel.ince****[email protected]> contains these words:

> the dizzy. He thinks is possibly a worn piston on number 7 (low comp)

Asuming from this snippet, we are talking V8, and all that messing with
the distributor, then it's highly likely that the dizzy is now ever so
slightly fecked, depending on year. at one time the whole gubbins was
only held on by a nylon/ plastic ring at the top under the rotor arm
instead of a circlip, hauling off the rotor arm caused this to come
adrift. Official LR tech bulletin on subject says remove rotor by
breaking with a hammer. After this comes adrift the centrifugal speed
advance mechanism at the bottom comes adrift and the bits do not go
quite down properly and the rotor sits too high in the cap. No repair
kits or parts are available. Course they are not all like this, so best
of luck. If plastic /nylon ring still there and O.K. then you can take
dizzy apart and get it all back together properly; the way the
centrifugal speed advance fits together is a real poser, and if you run
messed up for too long one or more of the springs gets stretched and you
wear a groove in the dizzy casing.
The only experiences I have of this type is on 3.5 efi with lucas 4cu
ecu. or 3.9 with lucas 14cux.

--
If you received this through the miracle of modern technology then all
is well; if not then situation normal.
Chris father of ( also at [email protected] )
www.users.zetnet.co.uk/barnes_firsnorton